85 entries under hard topic. ×
| insensible(adjective, strong, tough, inflexible) | |
| rigorous(resolute, rigid, inflexible, strict) | |
| solid(adjective, set, strong, tough) | |
| thick(adjective, strong, tough, firm) | |
| unchangeable(adjective, set, stiff, rigid) | |
| bullhead(adjective, mean, tough, harsh) | |
| callous(adjective, set, mean, strong) | |
| coke(noun, metal, pretzel) | |
| cold fish(expression, adjective, mean, unfeeling) | |
| fixed(adjective, mean, strong, tough) | |
| hanging tough(expression, adjective, mean, rigid) | |
| hard-and-fast(adjective, set, stiff, rigid) | |
| hard-boiled(adjective, mean, tough, harsh) | |
| hard-hearted(adjective, mean, tough, harsh) | |
| hard-nosed(adjective, mean, tough, harsh) | |
| mean(adjective, tough, harsh, unfeeling) | |
| mulish(adjective, mean, strong, tough) | |
| perverse(adjective, mean, tough, firm) | |
| pigheaded(adjective, mean, tough, firm) | |
| set in stone(expression, adjective, idiom, mean) |
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| APA | Smart Define. (2015). iron thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/iron/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "iron thesaurus" https://smartdefine.org/iron/thesaurus/synonyms (accessed September 28, 2026). |
| Harvard | Smart Define 2015, iron thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/iron/thesaurus/synonyms>. |
| MLA | Smart Define. "iron thesaurus" 14 April 2015. Web. 28 September 2026. <https://smartdefine.org/iron/thesaurus/synonyms> |